The KAC option is the lightest that works well, and being able to fold them aids with storage. They're the most expensive, but if you have a low powered variable with near-unity zoom at the low end, being able to leave them folded is excellent and gives you a storage/low-snag profile option. For a weight conscious rifle, I'd say the weight delta is worth the cost premium (over the Dueck RTS or similar) alone, the folding is just the side benefit.
Basically, since a low powered variable precludes the ability to run irons cowitnessed, offset irons are the next best thing. I don't find the support side to be quite as limiting (I don't run an angled cheekweld stock, just a UBR on those rifles), but that's still not great (but it's a low % use arrangement). More importantly, having an offset unity zoom sighting system with an optic that's dialed up to 4x-6x means engaging closer targets quickly becomes an option again without moving the support hand.
Finding them might require some patience, but they're around. The longest backorder I've observed the last few months was a matter of a few weeks; I'd argue it's worth the wait.
The KAC units do not play well with VLTOR's MUR-1A setup trying to mount them on the rear. I just gave up, removed the peep aperture adapter and ran both sights on the handguard - it works very solidly, and a side benefit is that I'm no longer losing track of the narrow front sight post on the KAC BUIS up front because of the really long sight radius + awkward head position. I'd say a wider front post would be slightly better, but in the configuration I'm running they're basically ideal.
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"Being able to do the basics, on demand, takes practice. " - Sinister
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